Combining Philosophers

All the ideas for Hermarchus, Susan Haack and GE Hughes/M Cresswell

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7 ideas

3. Truth / C. Correspondence Truth / 3. Correspondence Truth critique

2572	Logical truth seems much less likely to 'correspond to the facts' than factual truth does [Haack]

3. Truth / F. Semantic Truth / 1. Tarski's Truth / a. Tarski's truth definition

2570	The same sentence could be true in one language and meaningless in another, so truth is language-relative [Haack]

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / b. Terminology of PL

9540	A 'value-assignment' (V) is when to each variable in the set V assigns either the value 1 or the value 0 [Hughes/Cresswell]

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / d. Basic theorems of PL

9541	The Law of Transposition says (P→Q) → (¬Q→¬P) [Hughes/Cresswell]

4. Formal Logic / B. Propositional Logic PL / 4. Soundness of PL

9543	The rules preserve validity from the axioms, so no thesis negates any other thesis [Hughes/Cresswell]

5. Theory of Logic / K. Features of Logics / 4. Completeness

9544	A system is 'weakly' complete if all wffs are derivable, and 'strongly' if theses are maximised [Hughes/Cresswell]

25. Social Practice / F. Life Issues / 6. Animal Rights

6005	Animals are dangerous and nourishing, and can't form contracts of justice [Hermarchus, by Sedley]